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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d80b6dd85c54e963382fc837fcd7bfcb0477557865ac5836699530084c27204' 
  AND token = 'd7A4Nyr+VKCUxMbnyJXCvd7+Jnld8z/v840c1xnM4Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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