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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446681cdc0301c75b45cb78a136344c53ca4d7e1f6c1855c0e5c643af7809372' 
  AND token = 'LkS0a41zcEDZ1frTE1blNIHXVg09ZyLRZI0HEl+W3XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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