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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37950aec5dd539ddbf73a4800b018c4ec2b7003eb9692c1be251b72b84f0134' 
  AND token = '/TIrW+SHhuWu7mIpE7t6cqNg6HFvDdjlhKRsUwnQsdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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