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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a6823b3750a30a80d9d966d62c765a0a9c2ffc74009ee0f08705b176b67be3' 
  AND token = 'YkOqtZisPaQmGYxv0r3wf0Ux/D7YTQ5wJIKqw+YGaVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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