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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62d135821a3c698b7b9478120d44a988345b4ae62ed1c8edfb736c934570347' 
  AND token = 'GxbpGtHyaqSfcL2DpCPfDg3ZMqdIe7XgCCgx/NihgBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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