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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703d64c3629e60f9e7c77646fbe45814598d4465dc9eff18c9bd5bfcc9d40dd5' 
  AND token = 'hctKxbWCKGNGw6nwL0XD+0kjUXsy3TZc8niJqX1czZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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