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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefa57b912e8cc2a892fd646d7b1e0ebdcb6d737a3e8643a6a921acfdc3b838d' 
  AND token = 'EqSpDTKweO7vueY+3qEY9XvL9PsBzyUpHaK+2kQGUgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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