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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a86e5690a3d95e2ae5cc529e7fa113bc032d7d85dd9af914dbd1e8e287b5701' 
  AND token = 'xcp+eAG3/E4/WG839+mNkMQwhpG4MEWHAOhZR2FSpa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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