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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3530506c0b363f7a6dc2c9f31d0ebbcd3a8e5b56efa04244ebe81f14ca8308' 
  AND token = 'NTm85mab1Xn28ieIemQ5ilNAWXyWagNB6gOt61IzqYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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