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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b257b7378926509e7f3b4d8da4abab727073738675c0be736a87cfd55cf8149' 
  AND token = 'ZZXtg4iYMfEpGP1M2QPM74yJcK6pwJoAJsQ64tKp9qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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