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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033dd7c9eae71b12a7f826fea8b39b08ef4e55237c79b0084e22aceb84b460c0' 
  AND token = '99FzDSGgCpLnaQnPbR0y5UEeZczt+xSCxScb8Zikc+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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