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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d7b7db3721f47d10a5a48e3c55bb2f0d0539413c91864b7195396f8c929b40' 
  AND token = 'IQqG3QxV+/Bs4eN8Y6oZw4NxlI+MkXJa9ysRfda+Orc=' 
  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"
    }
  }
}