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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c815d38c3f3c4c355d00642283aac3cb550523bc8e7aa71dd127df9d73b45f2' 
  AND token = '/QVh4F6SG4UXvw9EFE71+p0W0VBBVxqNNQCn27SMe0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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