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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45eb904c7cfcec14f41c44fc9b6e6b7655f35e008acca2c9c85cb0f3a3253955' 
  AND token = 'uaRPKT39lUxIdzvoqkHT23h+L4Ai3jkIBlY0ScBGvVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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