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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdf71f71177c367459a462f00c7b7dd9144ecf0b7792c9c09ff0ff2870e7b2f' 
  AND token = 'XTaZNSeFhmYxHXPe44pbkfDIRkXpdJ2fDjaqk237PhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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