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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ea8aaef7ececa4ed18480a281e823b9e80232308d1cb68d18bb4ba75b52151' 
  AND token = 'GITRksCMNnUI3gCfAT45b+FyY1zkhcVXPjBQIxiIvEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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