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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa449a5e4c57717c4013af659848d98788bbd3cd24a5509220b603909ebea757' 
  AND token = 'mWhs+YTiW3J/sJQcLtpeJhMRkIa1skJ3BzxLymcqAhA=' 
  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"
    }
  }
}