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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd53614ca02ca44440288d8d7bb571899b0f86925f2a04068c2acd524e25e7ec' 
  AND token = 'mQzBd0giWvxjbkm0OFFHb0vJp06akucuflsn29bMArA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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