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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd5d7c9489382f0bd404f4a7f8d10d87b6cd50c76788be6d00f61237a41b12d' 
  AND token = 'pYd2TSoPYt8OBHWh7Cp8A3fhIPVZ2Bltc810SyyuVHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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