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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0162b46c9f63063de01751a55521b8cec97dfb91e6b90e4af1e550f34e272873' 
  AND token = 'pQ7dNJEeyvMYwWxuBke5SCh2s7+Eqy6hPqaVSDl2YpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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