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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425df4aee383da74a94bc020933998dfb94a2153f124978efe3be46918c7d4b8' 
  AND token = '2Gag7+zwJ+CiS1mV/XzfSFi9+5azuJ7/5OwG5fuXXjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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