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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548427f79ad183ab7d62fb2f81b9c4de19be6f7675a1a19a4b4b7f8f2d327fd5' 
  AND token = '8g98yXdJvq86w7CJZa2hbVxywbvhbMH/3aBvHnCXIJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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