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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f4812e1d5298cd2bd10654d2f0afd9a27678c72dcf12ff982788ea16a759dd' 
  AND token = '7AnI/LiHn6/IQ1OIPzfPlGwBCZ6hIfGLzCBeXB5ZP8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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