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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cd4eca6bc8b64e67619b46ccd61ba1389c17406d8fe40014d158c45a4b6f06' 
  AND token = 'xD8TI1qE9Gyj193xGz3u9t9S72hEmJNBqY1KaSibEBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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