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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a26b4b70789d8c5a665b8ec002765d0b5d665eb10a9ad21f2b57b62b44bb3c6' 
  AND token = 'I5aX9NIIn/3gD5Nob3XNLVg9DxxvY7tKf3NKxEoVqdY=' 
  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"
    }
  }
}