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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0ddf8b2d22d8abb9232f55e1fede902fbd031063712ce0e1ec5bf89a92df00' 
  AND token = '5xYQi3yObgL3VK0qKE7sXXTqcniUAf1Gzh6I344VT+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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