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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69606868a51144637550e8ad0eab42a587f79aa40a898f6aea80b97579749903' 
  AND token = '79MIl8s1H+StGWlb0qXPk203zAICCAW6U0sSB+6iEHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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