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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3275312fded828e0127d5685224269595330543ee0d29a82252e26090cc7b039' 
  AND token = 'y1nBLSOmZP7I5ZA6wRBNXf5MBDdXVGXFW5DaUnmR6PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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