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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90be2195f74db8219ea25781f99c9c4a48d32c6b1be7fe89d9591e98e71dd7cd' 
  AND token = 'TjyWTUNsyWo1tOLyBbaW9rSKUzvXfL8NM6WL7y+v1Fo=' 
  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"
    }
  }
}