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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ec452b369d92085418860290248e82052849d01991d50e0ace66de40ceeacd' 
  AND token = 'gkzxYpcc3IoI59q+9BqHssJth45bdtNgryRt3hEtP28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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