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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0657485bb227bacdc9090b006bff54bbfa26ba83310d0045f4f48c013967bd61' 
  AND token = 'LgSGDn8e54Di0HRW9tu79osoNfb5pdih1UCJWhvHohk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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