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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95e1db02e14cb47b2da32ed8832650c84792ce2b1219f2a0d7c31658e71d824' 
  AND token = 'pZUijdSLaCFGXh2M+45uhWQ68/ABpRWhYtyFSh/bnPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}