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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6672192f521bf9457c2cccea0d7aec74bde8e78b33c1b9de2b69dccee46b622' 
  AND token = 'NvFhOZ/BPox8tAtyEEkBDAFjt0mCU0Og6H4xpOvSyJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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