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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd48359478375998f7d5d3cc7196fa4ff057e9f62e324f065ef34a2edb3f1e4' 
  AND token = '7fiU2OoQRBxlk5r9GljxZxUCY74oRVgKx8WNM1pA7tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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