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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92273defdfef656ddc9689830044e3eee3592083d4b37f43bec1b07b9de7c696' 
  AND token = 'LP3v8YYkW2soUK3xAmB6umpLuVnNwMJZodtqogdnlz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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