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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3492198421f745189d737d5f0dafead55972cf7ec15cb2f01c6b9fc65fc4f0d' 
  AND token = 'wtCn4tG+Mfv2+sOR3VrEaFcRKz5qoFMilqnyerC8dwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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