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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1a815e63ff20b9588620e5d76f6da47f7d67a8621e9c38ae640f744dfb7180' 
  AND token = 'XrBncPikhnEK4fLC3Mqcn3D6DkU76TQqxIBfajSFpbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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