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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c938fe3c825d99cf8fc93c0f74dceed5ca11341b22a885b402a1927893ef43d' 
  AND token = 'F10b0WRiGpvqO5+CZI1Bt2C90tUQ15jVFVF5U3sZVrw=' 
  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"
    }
  }
}