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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5dbf6b81118064b9ca7f7373193619fe7a59e49a8a213bacf8f9041e3be3d8' 
  AND token = 'Gxi/SMW4CJNPUpeZlRvAKqgFxrAvRA1s/Y7Joep11tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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