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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c71d303a6d10c3e0699531875324ddc578911a5bd029478d03e447efbbbc7a0' 
  AND token = 'iYTGboAz7wh7iu1wkHHPG0eTu1PSFGklpl/b4msH0N4=' 
  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"
    }
  }
}