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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540b1392978e6b1bab75db8856a37bb66181923e3ad6797d07068867b76a2730' 
  AND token = 'X03h1g+gC/gVyVNbDf40Fo2+zuwwly4QLyjkfm5qKks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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