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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a564fc239b25b6b671de0cb92aa252ada620c80d2bc35d76eacf0f9eba6e8dd5' 
  AND token = 'yEqjco91M8fPhV7016fUChwKRoLLsbXpiloahGAw89s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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