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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec02b0c8df7598260256b4a3ebc86005e947a01a93f7dd5456884e0a9083a70' 
  AND token = 'R1q8MxNT2r6vz4wEZ+qBUdAtfeXbcsyRJX6Tr0yKtBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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