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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed234b0e7330402eac746b0150bea1f29d8c5f336efa4ec827bbc4d6102cc34' 
  AND token = '7YvGeRQ9gx1yY/JJddCA9cW8hQtqDv5US+26yE+fjlo=' 
  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"
    }
  }
}