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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfe2450db850f984b40a1bceeb14c1d7106455d4854ba2e9af8a227de3f58e9' 
  AND token = '/ZWoKDQ0S/Mvm7mC0pf5SitFFrmCE583A1CL8Il76/4=' 
  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"
    }
  }
}