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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa644aa61f3b1c97bbc0c01a9ffb3b1f44092bc9f47068599be0b3fd2f9f828' 
  AND token = '+8KMU5Un4307crPL+0EjcfUCc0OyO7yDnkffJF+mY0g=' 
  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"
    }
  }
}