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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347bbe7cd5a964b779536b1e57c5b6ada33ddcf56c9e6797eb6ac98967bcb8b9' 
  AND token = 'r8AExDEkcOySL/i7Eqyvpx0n0TWEjAQFxrgkjJ9dgkU=' 
  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"
    }
  }
}