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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd84d9ced59aa33d1599c59c62ca875e4e06aa978bd73c7cb88465c30de193de' 
  AND token = '7kkTm1GGgI9aEo+7kkWMBtrUPIDXBlCXxV7r0/HANkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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