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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3e4e34b75e500bf42f0441b21de771d536b2ecde3a8f04fd2bfe6b59286ce8' 
  AND token = 'XJswa5LgY9lEteYj+9lEv6QgxixpLgurjsZ8gfLR7mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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