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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2001ce06e01926172f525672c8473e4dd82b885810318d5aee4016bc0c6774' 
  AND token = 'O8wRAVqreQtIQPNZIO6LRZhmRq4ATA1kZxQaRMQFprs=' 
  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"
    }
  }
}