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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd740260d9988ba72bbbc4a2e5bbd602d7e0179f8acefcd3b05f5d3f0c1da9080' 
  AND token = 'RRwkGrZz1kQBljhpj6ZNraJeDtreU9Y+AZey7sy7VDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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