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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de61a12a88e0d8ed3af78a896b8811af81aa8c9b870f06a8ff1a8b46e09160d' 
  AND token = 'asyL5m1HKRZvVcfWBvo3EtRmOzhJAC3DpSB3N0owPwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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