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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fe25b8221a8dd1a618eddfa7b6043b24d004587b3afb9bccebb883ccf91eef' 
  AND token = '4j4yIVCMJBNk9mA5PjqWHN1uxoBgc+9MJj34E4fac3o=' 
  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"
    }
  }
}