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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659293b25d26178bb0348d163c8447d6c4a7f365134e6f1b4e260ec6efa366f4' 
  AND token = 'GVfLjvdVic/UkWCdSK+ol2nuQW9fIdc46TaBr1N870M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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